feat: std::format support for dpp::snowflake

[ruslan-ilesik]

This pr adds std::format support for dpp::snowflake, if we do not have c++20 or have no include for it will be automatically disabled for compilation.

Test case was implemented to check formatting.

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• [X] I have ensured that all methods and functions are fully documented using doxygen style comments.
• [X] My code follows the coding style guide.
• [X] I tested that my change works before raising the PR.
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[Henonicks]

tested this on Windows and got snowflake: std::format support PASS at the end

[ruslan-ilesik]

So with last commit i have introduced usage of Cmake feature called configure_file which allows us autogenerate headers with some definitions when build dpp, this way we can remove need to define DPP_HAS_FORMAT as it will be defined in it when compiling it.

In theory same way we can eliminate need to specify -DDPP_CORO when compiling bot with dpp with coro enabled in lib.

[ruslan-ilesik]

If lib is build with c++20 then ye, bots will be required to use c++20, I can easily fix it by wrapping cmake define into check of c++ version.

[ruslan-ilesik]

I have tested changes locally on my wsl2 (ubuntu) and tests passed, also compiling bot with -DPP_FORMATTERS and without had required behavior